EXHIBIT
      32.2
     
    Certification
      of Chief Financial Officer Regarding Form 10-Q for the Three Months Ended March
      31, 2008 
    Pursuant
      to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the
      Sarbanes-Oxley Act of 2002
     
    In
      connection with the Quarterly Report of Redwood Trust, Inc. (the “Company”) on
      Form 10-Q for the three months ended March 31, 2008, as filed with the
      Securities and Exchange Commission on the date hereof (the “Report”), I, Martin
      S. Hughes, Chief Financial Officer of the Company, certify, pursuant to 18
      U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
      Act of 2002, that:
     
    (1)
      The
      Report fully complies with the requirements of Section 13(a) or 15(d) of the
      Securities Exchange Act of 1934 as amended; and
     
    (2)
      The
      information contained in the Report fairly presents, in all material respects,
      the financial condition and results of operations of the Company for the periods
      indicated.
     
    
      
          
            | Date:
                May 7, 2008 |  | /s/
                MARTIN
                S. HUGHES | 
          
            |  |  | Martin
                S. Hughes Chief
                Financial Officer and Secretary |